Process for treating municipal wastewater sludge

Details Process for treating municipal wastewater sludge Process for treating municipal wastewater sludge

1987-09-14

1988-08-23

Wyse, Tom

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210721, 210725, 210727, 71 12, C02F 1114

Patent

active

047659114

ABSTRACT:
An improved process for treating aerobic or anaerobic sewage sludge comprises a two-stage treatment with sulfur dioxides. In the first stage, between 25 and 40 pounds of sulfur dioxide per ton of dry sludge solids as reacted to optimize solids separation while substantially reducing coliform counts to acceptable environmental protection limits. Solids are separated and water discharged. Recovered solids are then treated with between 300-500 pounds of sulfur dioxide per dry solids ton to solubilize heavy, toxic and noble metals which may be recovered from the liquor. Separated sludge solids form a desirable and hazardous metal-free fertilizer.

REFERENCES:
patent: 1511418 (1924-10-01), MacLachlan
patent: 4038180 (1977-07-01), Talbert
patent: 4053394 (1977-10-01), Fisk
patent: 4224148 (1980-09-01), Lindman et al.
patent: 4267058 (1981-05-01), Kyri et al.
patent: 4340489 (1982-07-01), Adams et al.
patent: 4600513 (1986-07-01), Mizutani et al.
patent: 4671882 (1987-06-01), Douglas et al.

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